đ„ JavaScript Interview Series(10): Functional Programming â map, reduce, filter Explained
Functional programming is a hot topic in JavaScript interviews. Hiring managers want to see that you can write clean, predictable, and maintainable code. Mastering the array methods map, filter, and reduce is a fantastic way to demonstrate these skills. Let's dive into some common interview questions that will test your understanding of these powerful tools.
map, filter, and reduce?
Key Concept: This question assesses your high-level understanding of the purpose of each method.
Standard Answer: The fundamental difference lies in what they do and what they return.
map transforms each element in an array and returns a new array of the same length with the transformed elements. Think of it as creating a one-to-one mapping from the original array to a new one.
const numbers = [1, 2, 3];
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